roelof wrote:Edit : Can I be that 1G memory is too small for a graphical installation.
It's definitely not due to that. I GB of RAM is fine for a graphical installation.
I think the best you can do now is to file a bug report (see the link 'Bugs' at top of this page) with as much information as you can, so that the developers can investigate. Although you can't get to a Desktop, can you get to a VT (virtual terminal) by pressing Ctrl-Alt-F1 (or F2, or F3 up to F6)? If you can, log in as root user and save the files /var/log/messages and /var/log/Xorg.0.log to a pen drive, along with the files lsmod.txt and lspci.txt which you can create using the commands lsmod > lsmod.txt and lspci > lspci.txt. Then you can attach those files to your bug report to help the developers diagnose the problem.